I am so excited for this movie!! It looks super cute too XD. It'll be in japan theatres September 1st. But anyways, it starrs Ayase Haruka and Okada Masaki.
for more info, read here :: http://www.tokyohive.com/2012/07/full-trailer-for-himitsu-no-akko-chan-released/
http://www.youtube.com/watch?v=KuBLiKVwg10